package bishi.day27_5_25;

import java.math.BigInteger;
import java.util.*;

/**
 * @author 是阿秋啊
 * @date 2022/05/25 08:42
 **/
public class san_jiao_xing {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        while(sc.hasNext()) {
            BigInteger a = sc.nextBigInteger();
            BigInteger b = sc.nextBigInteger();
            BigInteger c = sc.nextBigInteger();
            if(a.add(b).compareTo(c) > 0 && a.add(c).compareTo(b) > 0 && b.add(c).compareTo(a) > 0) {
                System.out.println("Yes");
            }else{
                System.out.println("No");
            }
        }
    }
}